from qgis.PyQt.QtCore import QCoreApplication
from sn_basis.ui.navigation import Navigation

class BasisPlugin:
    def __init__(self, iface):
        self.iface = iface
        self.ui = None
        QCoreApplication.instance().aboutToQuit.connect(self.unload)

    def initGui(self):
        self.ui = Navigation(self.iface)

    def unload(self):
        if self.ui:
            self.ui.remove_all()